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Just Neck Preserving Stem

Just Neck Preserving Stem

Category: Permedica Orthopedics

INTENDED PURPOSE:

JUST Femoral Neck Prosthesis is a small device intended for primary Total Hip Replacements procedures together with a femoral ball-head and an acetabular cup. Indicated for primary hip arthroplasties in those cases where the pathology does not involve the femoral neck such as femoral head necrosis and/or early stage arthrosis.

Anchorage of the device to the bone is achieved by press-fit insertion, without the use of bone cement.


MATERIALS:

            STEM: Titanium Aluminium Niobium forged alloy (Ti6Al7Nb) ISO5832/11


STERILIZATION:

            Method: Irradiation (Beta or Gamma rays - nominal dose 25 kGy) or vaporized Hydrogen Peroxide (VH2O2).

            Validity: 5 years (Beta) - 10 years (Gamma-VH2O2).

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Neck 
preserving
cementless stem

The real neck prosthesis

The anatomy of the proximal femoral neck has a particular trabecular structure that implies a precise system of distribution of the forces and transmission of the load. The JUST prosthesis fits perfectly into the bone trabecular system. Following Wolff’s law, it recreates a physological bone remodelling, utilizing the same trabecular system for osseointegration.


8 Implant sizes


Taper

        12/14 (top angle 5°42'30") BIOLOX approved


Bio-active coating

The proximal portion is coated with 300μm of porouspure Titanium and 80 μm of hydroxyapatite, applied with plasma-spray technique in order to obtain good primary stability and to encourage osseointegration.


Polished surface in the distal tip.












Physiological load bearing support


The solid calcar region, crisscrossed by dense trabeculae of the principal compressive group, support the implant. The arches of the inferior trabecular structure support the tail section of the Just prosthesis which acts as a “keystone” guaranteeing it’s stability.